camera.screenToWorld only starts working during update

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The following script has a camera linked to it, and is trying to find the bottom right screen-coordinate in world-space. Basically I’m trying to align something to the screen edge. I encountered some weird results from camera.screenToWorld however. It seems that in Initialize and PostInitialize the camera is accessible but gives strange results.

Is there a proper way of waiting until the camera is ready? or am I doing something else wrong?

var Test = pc.createScript('test');

Test.attributes.add('cameraEntity', { type: 'entity'});

Test.prototype.initialize = function() {
    var screenCoords = this.measureScreen();
    console.log("initialize x:" + screenCoords.x + " y:" + screenCoords.y);
};

Test.prototype.postInitialize = function() {
    var screenCoords = this.measureScreen();
    console.log("postinitialize x:" + screenCoords.x + " y:" + screenCoords.y);
};

Test.prototype.update = function(dt) {
    var screenCoords = this.measureScreen();
    console.log("update x:" + screenCoords.x + " y:" + screenCoords.y);
};

Test.prototype.measureScreen = function() {
    return this.cameraEntity.camera.screenToWorld(
        this.app.graphicsDevice.width,
        this.app.graphicsDevice.height, 
        this.cameraEntity.camera.nearClip);
};

here’s the output from my scene:

initialize x:8.25738525390625 y:-5.94846248626709
postinitialize x:8.25738525390625 y:-5.94846248626709
update x:1.6625607013702393 y:-0.9826755523681641
update x:1.6625607013702393 y:-0.9826755523681641
...

I tested it in an empty scene, with only a camera and only the ‘test’ script on the camera and got the same results:

image.png1799×774 122 KB